[Bug 1656280] Re: Support installing subordinate systemd on Ubuntu Desktop 14.04.5

[Dave Morley]

I have tested this fix, I can run lxc1 from backports, lxd from
backports and lxc from stable. I can also install and run snaps as
expected.  I have also had no ill affects from using this version of
systemd.

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Title:
  Support installing subordinate systemd on Ubuntu Desktop 14.04.5

Status in systemd package in Ubuntu:
  Invalid
Status in systemd source package in Trusty:
  Fix Committed

Bug description:
  Add support for installing deputy systemd for snapd on Ubuntu Desktop
  14.04.5

  When installed, deputy systemd provides a subset of functionality as required for snapd:
  * Providing necessary units for power management via systemctl
  * Provides private socket API access (and thus systemctl as root) only, and is not present on the system D-Bus
  * Does not conflict with systemd-shim
  * Does not change behaviour of systemd-services nor udeb build in anyway

  [Impact]

   * Users can install snapd without regressing Desktop support,
  lxc/lxc1/lxd abilities.

  [Test Case]

   * Power management works (e.g. shutdown/reboot via indicator-system
  and via systemctl)

   * Timedatectl commands report NTP status enable/disabled correctly,
  and can change it

   * Can install and use snapd

   * Can install and use lxc / lxc1 / lxd

  [Regression Potential]

   * Minimal, as bin:systemd uses a separate build in the package with
  additional patches to not intefere with cgmanager's name=systemd
  cgroup; and instead deputy bin:systemd uses name=dsystemd cgroup for
  process management.

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